1. 
  cat << FINE > filediinput.txt
  .....
  .....
  FINE

  cat filediinput.txt | grep "riga" | LC_ALL="C" sort

2. 
 cat filediinput.txt | tr ' ' '*'

3. 
 cat /etc/passwd | cut -d: -f1 | LC_ALL="C" sort

4. 
 find . -type f -mmin -30

5. 
 vedere script cerca.sh

6. 
 vedere script menu.sh
